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# Copyright 2021-2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import asyncio
import io
import logging
from .common import Transport, StreamPacketSource, StreamPacketSink
# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------
logger = logging.getLogger(__name__)
# -----------------------------------------------------------------------------
async def open_file_transport(spec: str) -> Transport:
'''
Open a File transport (typically not for a real file, but for a PTY or other unix
virtual files).
The parameter string is the path of the file to open.
'''
# Open the file
file = io.open(spec, 'r+b', buffering=0)
# Setup reading
read_transport, packet_source = await asyncio.get_running_loop().connect_read_pipe(
StreamPacketSource, file
)
# Setup writing
write_transport, _ = await asyncio.get_running_loop().connect_write_pipe(
asyncio.BaseProtocol, file
)
packet_sink = StreamPacketSink(write_transport)
class FileTransport(Transport):
async def close(self):
read_transport.close()
write_transport.close()
file.close()
return FileTransport(packet_source, packet_sink)
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